ML20010B752
| ML20010B752 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 08/10/1981 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20010B721 | List: |
| References | |
| IEB-80-06, IEB-80-6, NUDOCS 8108170514 | |
| Download: ML20010B752 (2) | |
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SAFETY EVALUATION REPORT ZION STATION, UNITS 1 AND 2 LICENSIE RESPONSE TO 1&E BULLETIN 80-06, ENGINEERED SAFETY FEATURE (ESF) RESET CONTROLS
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INTRODUCTION Instances have been reported at operating nuclear power plants where it had been found that following the r'eset of an ESF actuated signal, certain equipment (e.g., ventilation dampers, motors, and valves) would return to its normal mode which could compromi'se'.'the protective actions of the affected systems.
As a result, on March 13, 1980 the NRC issued I&E Bulletin 80-06 requesting certain actions to be taken by licensees for all PWR and BWR facilities with -
operating licenses.
EVALUATION The enclosed report (EGG 1183-4214) was prepared for us by EG&G, Inc.,
San Ramon, California as part of our technical assistance contractor program.
It provides their technical evaluation of the licensee's response to I&E
-Bulletin 80-06 in accordance with NRC-provided guidance.
d For all safety systems, EG&G concluded that safety-related ecuipment remains in its emergency mode pcsitioniupon ESF reset except for the Service Water Strainer Sackwash Discharge valve, two Hypochlorite Injection valves, the Residual Heat Removal (RHR) pump valves and the Containment Fan Cooler Dampers.
These components are common to bot.h units. The licensee committed to modify the ' Service Water Strainer Backwash Discharge valve by installing a reset button that opens the valve only after Safety Injection (SI) has been reset.
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The licensee also ccamitted to modify the Hypochlorite Injection valves by disconnecting them since they are not used at the Zion Station.
The licensee offered justificatien for not modifyi the RHR pump valves and the Contain-ment Fan Cooler Dampers, which EG&G concluded contained sufficient information 9100170514 910010 '
PDR ADOCK 05000295 O
, for us to decide these issues.
EG&G did not evaluate these items.
- Further, the licensee performed verification tests on all associated equipment (including modifications) during recent refueling outages in both units to demonstrate' compliance.
Therefore, EG&G found the plant to satisfy the requirements of I&'E Bulie+in 80-06 with the exceptions of the RHR pump valves and the Containment Fan Cooler Dampers.
We have reviewed the rjicensee's justification for not modifying the RHR pump valves and find, it acceptable on the basis that these valves automatically open on SI, Containment Spray, or RHR pump operation and will not close f
until the RHR pump is stopped.
We have also reviewed the licensee's justifica-tion for not modifying the Containment Fan Cooler Dampers and find it accept-
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able on the basis that the dampers will not change position after the operator, as req'gired by procedures, places the control switch in the accident position.
CONCLUSION
. Based on the information and documents provide'd by the licensee, and on our review of the contractor's report, we comclude inat the licensee has satisfied the concerns of I&E Sulletin 50-06, subject to verification by'I&E cf successful test completion.
Therefore, we find the ESF reset controls for the Zion Station, Units 1 and 2 in compliance with NRC criteria.
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